How Family Offices Structure Direct Co-Investments Alongside Private Equity Sponsors

According to the UBS Global Family Office Report 2024, direct co-investments represent 10% of the average family office's private equity allocation—a modest share that draws disproportionate attention because co-investments typically arrive with materially lower fees than a main fund. The standard PE fund charges a 2% annual management fee plus 20% carried interest. A co-investment alongside that same sponsor in the same deal routinely prices at 0% management fee and 0% to 10% carry, a structural fee advantage that, compounded across a five-to-seven-year hold period, can add hundreds of basis points to net returns. This guide explains exactly how family offices earn access to these deals, how the legal and operational machinery works, and where things genuinely go wrong.

What a Co-Investment Is and Why the GP Offers It

A co-investment occurs when a private equity sponsor (the "GP," or general partner) invites selected limited partners to put capital directly into a specific deal alongside the main fund. The GP is not trying to do anyone a favor. There is a mechanical reason: the target company requires more equity than the GP wants to deploy from the main fund alone.

A GP running a $2 billion fund with standard portfolio construction limits,say, no single company exceeding 15% of fund capital,can write a maximum check of roughly $300 million per deal. If the target requires $400 million of equity, the GP has two choices: walk away from the deal or bring in co-investment capital to cover the $100 million gap. Co-investors fill that gap, invested in the same security, at the same price, on the same closing date as the main fund. Add-on acquisitions follow the same logic: the platform company needs more equity to absorb a bolt-on target, and the GP uses co-investment to fund the difference without exceeding concentration limits in the main fund.

The co-investment travels through a separate legal entity: a special purpose vehicle (SPV), usually a Delaware LLC formed specifically for that deal. The GP of the main fund, or an affiliate, serves as the manager of the co-investment LLC. The SPV carries its own operating agreement, its own subscription documents, and its own Form D filing with the SEC, which must be submitted within 15 calendar days of the first sale of securities, as Carta's fund administration documentation on SPV structures explains in detail. An LP's accredited-investor status in the main fund does not extend automatically to the co-investment vehicle; each co-investor re-qualifies and signs independently.

The Fee Math That Motivates Family Offices

The primary driver of family office demand for co-investments is simple and computable: the fee discount versus the main fund is large, and it compounds.

A fund charging 2% management fee on $100 million committed for five years extracts $10 million before any carry calculation. Then it charges 20% of profits above a preferred return,commonly 8%. A co-investment vehicle charging 0% management fee and 0% carry takes nothing. Even a "light" co-investment structure at 0.5% management fee and 10% carry is a meaningfully better deal for the LP on any deal that performs. On a deal that returns 3x gross over five years,a reasonable buyout benchmark,the fee-free co-investor keeps substantially more of the gross spread above cost than the fund LP does after fees and carried interest are deducted.

The Institutional Limited Partners Association (ILPA) Principles 3.0 state that any management fees charged on a co-investment vehicle should accrue back to the underlying fund as an offset,meaning GPs who do charge co-investment fees face governance pressure from sophisticated LPs to return those economics to the main fund. That pressure has pushed co-investment pricing consistently toward the low end of the permissible range. The ILPA guidelines also require GPs to provide the strategic rationale for offering a co-investment tranche rather than funding the full deal through the main fund, which helps LPs assess whether the offer represents genuine access or a risk-sharing exercise on a deal the GP is less confident about.

How Family Offices Win Co-Investment Allocation

Co-investment rights are not automatically granted to every LP in a fund. GPs have discretion, and that discretion flows through two primary channels.

The first channel is fund size and relationship depth. A family office writing a $50 million check into a $2 billion fund is a 2.5% LP,meaningful but not dominant. A family office that commits $200 million is a 10% LP, and the GP has strong economic and relationship incentives to keep that LP engaged with deal flow and committed to future funds. The Campden Wealth and RBC North America Family Office Report 2024 found that 83% of North American family offices hold private equity investments, and surveyed chief investment officers consistently report receiving co-investment offers through existing fund-manager relationships rather than through open solicitation. The family office that has been in a GP's fund for two or three cycles,and that has never passed on a capital call or caused administrative headaches,is the one that gets the call first when a co-investment opens.

The second channel is operational and sector expertise. A PE firm acquiring a platform company in healthcare technology is happy to bring in a family office whose principals built and sold a healthcare technology business, because that person adds board credibility, gives management an experienced industry voice, and provides the GP with competitive intelligence it cannot buy elsewhere. GPs explicitly look for LPs who bring attributes beyond the check size. Some family offices cultivate this positioning deliberately, structuring their fund investments to favor sponsors whose sector focus overlaps with the family's operating history.

A third route exists but is less reliable: side letter rights. A large LP can negotiate, as a condition of a fund commitment, a right of first offer on co-investment opportunities within that fund. ILPA Principles 3.0 require GPs to disclose to all LPs when co-investment side letter rights have been granted to specific investors,disclosure does not prevent it, but it creates accountability and allows other LPs to negotiate comparable terms in future funds.

The Compressed Timeline Problem

Here is where co-investments become operationally hard to execute. A PE sponsor doing an acquisition has a signed purchase agreement with a fixed closing date. The GP needs to assemble its co-investment capital before that date. The family office receives the co-investment invitation,typically a brief deal summary, a management presentation, and a financial model,and must decide whether to commit within a window that Campden Wealth and RBC's surveyed chief investment officers described as roughly two weeks in many cases, and sometimes far shorter when a deal timeline accelerates.

That timeline mismatch creates what practitioners call the diligence gap. The GP has spent three to six months on full buy-side due diligence: management interviews, customer reference checks, legal and financial review, third-party market studies, and environmental reports where applicable. The family office gets a compressed data room and, typically, the GP's own investment committee memo. The family office is relying in practical terms on the GP's judgment,which means the quality of the co-investment outcome is tied closely to the quality of that particular GP's underwriting process and the depth of trust the family office has built in that GP over prior fund cycles.

For family offices without a dedicated private equity deal team,which describes most single-family offices,this is not a minor operational problem. The CIO is coordinating outside counsel, tax advisors, and possibly an operating advisor to review documents quickly, in parallel, while managing the rest of the portfolio. Family offices that consistently execute co-investments well tend to be those that have pre-arranged legal counsel, agreed on internal decision-making authority thresholds, and built a working relationship with the GP's investor relations team before the first co-investment opportunity arrives.

Real Risks That Deserve Straight Language

Concentration risk. A fund that invests in 15 to 20 companies gives each LP indirect exposure across a diversified portfolio. A co-investment puts 100% of the deployed capital into one company. If the deal thesis is wrong,wrong management team, wrong competitive position, unexpected operational failure,the co-investment can produce a zero return or a total loss. This is a categorical change in risk profile compared to fund investing. Family offices that size co-investments aggressively relative to their total portfolio are accepting single-name risk that most institutional portfolios deliberately limit through position-size rules.

Adverse selection risk. There is a structural argument that GPs offer co-investment access on their lower-conviction deals, preferring to keep the full upside in the main fund on the best opportunities while spreading risk on deals they are less certain about. This conflict is real and worth naming plainly. However, the academic evidence is more nuanced than the concern implies. A 2020 study in the Journal of Financial Economics by Braun, Jenkinson, and Schemmerl,using a large sample of buyout and venture capital co-investments,found no statistically significant evidence of systematic adverse selection. Co-investment gross returns were statistically similar to other deals in the same funds. That said, the finding is a dataset average, not a guarantee for any individual transaction. A deal offered to co-investors precisely because internal GP consensus was weak, or because the GP needed to spread risk on an oversize position, can still carry adverse-selection dynamics in specific cases. Asking the GP directly why co-investment is being offered on this particular deal,and what the main fund's own allocation to the deal is,is a reasonable question that any family office should pose before committing capital.

Operational and governance risk. The compressed timeline, the legal review of SPV documents, ongoing monitoring responsibility, and the illiquidity of a five-to-seven-year hold all require dedicated internal capacity. Family offices that co-invest without a named professional responsible for tracking these positions tend to encounter surprises late in the hold period, when the portfolio company needs an equity cure, a management replacement, or a board vote that requires the co-investor to act. These governance obligations do not dissolve because the position is structured as passive.

Structuring the Co-Investment SPV in Practice

When a family office commits to a co-investment, the mechanics proceed as follows. The GP, or an affiliated entity, forms a Delaware LLC with the GP serving as manager. The family office signs a subscription agreement and a private placement memorandum disclosing deal-specific risks. As the American Bar Association's analysis of co-investment structures documents, co-investments can be structured as active (the family office has direct involvement in portfolio company governance) or passive (the family office invests through the SPV and the GP makes all operating decisions). Most family office co-investments are passive structures.

Capital is called at or near closing of the underlying deal, meaning the family office must have the capital ready to wire within days of receiving a capital call notice. The operating agreement of the co-investment LLC governs fee terms, the distribution waterfall, broken-deal expense allocation if the acquisition falls apart before closing, information rights, and the manager's authority over investment decisions. Family offices with negotiating strength can push for pro rata preemptive rights on follow-on investments, board observer rights if the commitment is large enough, and co-sale rights tied to the GP's exit. Smaller commitments typically receive standard passive terms with no board-level visibility.

At exit,typically a sale to a strategic buyer, a secondary PE firm, or a public offering,the co-investment LLC distributes proceeds. The tax treatment depends on hold period and how the LLC is characterized for tax purposes, including whether the family office receives ordinary income or long-term capital gain treatment on its share of proceeds. Tax counsel should review the operating agreement and expected hold structure before the subscription agreement is signed, not after.

For more on this, see our related coverage:

• Family Office Allocation to Alternatives in 2026: What the Data Actually Shows
• Family Offices Aren't Smart Money Anymore, They're the New Retail
• What Is an LP Advisory Board (LPAC) in a Private Equity Fund? Powers, Limits, and Why It Matters

Frequently Asked Questions

What fund commitment size do you need to earn co-investment access?

There is no universal threshold, but most sponsors prioritize co-investment notifications for LPs who represent at least 5% to 10% of a fund's total capital or who have a multi-fund history with the GP. A $10 million commitment into a $2 billion fund is unlikely to generate consistent co-investment access; a $75 million or $100 million commitment is a materially different conversation. Some GPs pre-qualify LPs during the fundraising process, asking about internal diligence capacity and approval timelines before adding them to the co-investment notification list.

Are co-investment net returns actually better than fund returns?

The academic evidence, including the 2020 Braun-Jenkinson-Schemmerl study published in the Journal of Financial Economics, shows that co-investment gross returns are comparable to other deals within the same fund, but net returns to co-investors are higher because of lower fees and carry drag. Whether that advantage holds in any individual family office's portfolio depends on deal selection, position sizing relative to total assets, and whether the family office is receiving access to the same quality of deal flow as the main fund or only to deals the GP could not fully allocate internally.

What happens to co-investment capital if the underlying deal falls apart before closing?

Broken-deal expenses are generally allocated pro rata across the main fund and the co-investment vehicle under ILPA best practices. If the family office has signed a subscription agreement and the transaction does not close, committed capital is returned, but the family office may bear a share of due diligence and legal costs already incurred. The operating agreement of the co-investment SPV should address this allocation explicitly, and family offices should read that provision carefully before signing rather than relying on assurances from the GP's relationship team.

Can a family office access co-investments without being an LP in the sponsor's main fund?

Rarely, but it does happen. Some GPs invite co-investment from well-known family offices they know professionally, even without an existing fund relationship, when the family brings specific sector expertise a particular deal requires. More commonly, family offices without a direct GP relationship access co-investments through intermediary co-investment vehicles managed by established private markets firms, which pool multiple investors into a diversified stream of co-investment opportunities,typically with the fee discount partially offset by the intermediary's own management economics.

Author Disclosure: Jeff Barnes, MBA has no personal position in any company, fund, or platform named in this article. Angel Investors Network has no current commercial relationship with any party mentioned. AIN provides marketing and education services, not investment advice. Past performance does not guarantee future results. All investments involve risk, including loss of principal.